One vertex per element, one color per generator, with an edge from x to x·s.
(9,10)(11,15)(12,20)(13,17)(14,18)(16,22)(19,23)(21,24)(25,26,31,29)(27,28,35,32)(30,37,39,33)(34,40,38,36)(1,2)(3,6)(4,5)(7,8)(11,18)(14,15)(19,21)(23,24)(25,27,31,35)(26,32,29,28)(30,34,39,38)(33,40,37,36)(2,5)(3,7)(9,11,13,18)(10,14,17,15)(12,21,22,19)(16,24,20,23)(25,27,31,35)(26,32,29,28)(30,38,39,34)(33,36,37,40)(3,7)(6,8)(9,10)(11,14)(12,16)(13,17)(15,18)(19,23)(20,22)(21,24)(25,28)(26,27)(29,35)(30,36)(31,32)(33,34)(37,38)(39,40) involution — undirected(1,3)(2,6)(4,7)(5,8)(9,11)(10,15)(12,19)(13,18)(14,17)(16,24)(20,23)(21,22)(25,29,31,26)(27,32,35,28)(30,37,39,33)(34,40,38,36)(1,2)(3,6)(4,5)(7,8)(9,12)(10,16)(11,19)(13,22)(14,23)(15,24)(17,20)(18,21)(25,30,31,39)(26,33,29,37)(27,34,35,38)(28,36,32,40)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.